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H3A is a weak triprotic acid (K(a1) =...

`H_3A ` is a weak triprotic acid ` (K_(a_1) =10^(-5) ,K_(a_2) =10^(-13) ) . `What is the value of pX of 0.1 M `H_3 A(aq.) ` solution ? Where pX ` =- log X and X = ([A^(3-)])/([HA^(2-)]) `

A

`7`

B

`8`

C

`9`

D

` 10`

Text Solution

Verified by Experts

The correct Answer is:
D
` H^(+)` ions from ` I^(st) ` step is only considered
` [H^(+) ] =sqrt(Ka_1 xx C) =sqrt( 10 ^(-6)) =10 ^(-3) M`
` X =([A^(3-)])/( [HA^(_2) ]) =(Ka_3)/([H^(+) ] ) rArr X =10 ^(10) rArr pX =10 `
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Knowledge Check

  • K_(1) and K_(2) of H_(2) S are 10^(-3) and 10^(-12) respectively what is [S^(-2)] in 0.1 M H_(2) S buffered at p^(H) =2

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